![Robert Love](/assets/img/avatar_default.png)
Background: 1) dmi_check_system() returns the count of the number of matches. Zero thus means no matches. 2) A match callback can return nonzero to stop the match checking. Bug: The count is incremented after we check for the nonzero return value, so it does not reflect the actual count. We could say this is intended, for some dumb reason, except that it means that a match on the first check returns zero--no matches--if the callback returns nonzero. Attached patch implements the count before calling the callback and thus before potentially short-circuiting. Signed-off-by: Robert Love <rml@novell.com> Cc: Andrey Panin <pazke@donpac.ru> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
302 lines
7 KiB
C
302 lines
7 KiB
C
#include <linux/types.h>
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#include <linux/string.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/dmi.h>
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#include <linux/bootmem.h>
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static char * __init dmi_string(struct dmi_header *dm, u8 s)
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{
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u8 *bp = ((u8 *) dm) + dm->length;
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char *str = "";
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if (s) {
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s--;
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while (s > 0 && *bp) {
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bp += strlen(bp) + 1;
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s--;
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}
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if (*bp != 0) {
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str = alloc_bootmem(strlen(bp) + 1);
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if (str != NULL)
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strcpy(str, bp);
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else
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printk(KERN_ERR "dmi_string: out of memory.\n");
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}
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}
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return str;
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}
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/*
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* We have to be cautious here. We have seen BIOSes with DMI pointers
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* pointing to completely the wrong place for example
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*/
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static int __init dmi_table(u32 base, int len, int num,
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void (*decode)(struct dmi_header *))
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{
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u8 *buf, *data;
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int i = 0;
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buf = bt_ioremap(base, len);
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if (buf == NULL)
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return -1;
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data = buf;
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/*
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* Stop when we see all the items the table claimed to have
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* OR we run off the end of the table (also happens)
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*/
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while ((i < num) && (data - buf + sizeof(struct dmi_header)) <= len) {
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struct dmi_header *dm = (struct dmi_header *)data;
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/*
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* We want to know the total length (formated area and strings)
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* before decoding to make sure we won't run off the table in
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* dmi_decode or dmi_string
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*/
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data += dm->length;
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while ((data - buf < len - 1) && (data[0] || data[1]))
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data++;
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if (data - buf < len - 1)
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decode(dm);
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data += 2;
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i++;
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}
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bt_iounmap(buf, len);
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return 0;
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}
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static int __init dmi_checksum(u8 *buf)
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{
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u8 sum = 0;
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int a;
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for (a = 0; a < 15; a++)
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sum += buf[a];
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return sum == 0;
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}
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static char *dmi_ident[DMI_STRING_MAX];
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static LIST_HEAD(dmi_devices);
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/*
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* Save a DMI string
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*/
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static void __init dmi_save_ident(struct dmi_header *dm, int slot, int string)
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{
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char *p, *d = (char*) dm;
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if (dmi_ident[slot])
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return;
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p = dmi_string(dm, d[string]);
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if (p == NULL)
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return;
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dmi_ident[slot] = p;
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}
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static void __init dmi_save_devices(struct dmi_header *dm)
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{
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int i, count = (dm->length - sizeof(struct dmi_header)) / 2;
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struct dmi_device *dev;
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for (i = 0; i < count; i++) {
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char *d = ((char *) dm) + (i * 2);
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/* Skip disabled device */
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if ((*d & 0x80) == 0)
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continue;
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dev = alloc_bootmem(sizeof(*dev));
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if (!dev) {
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printk(KERN_ERR "dmi_save_devices: out of memory.\n");
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break;
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}
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dev->type = *d++ & 0x7f;
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dev->name = dmi_string(dm, *d);
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dev->device_data = NULL;
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list_add(&dev->list, &dmi_devices);
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}
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}
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static void __init dmi_save_ipmi_device(struct dmi_header *dm)
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{
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struct dmi_device *dev;
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void * data;
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data = alloc_bootmem(dm->length);
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if (data == NULL) {
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printk(KERN_ERR "dmi_save_ipmi_device: out of memory.\n");
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return;
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}
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memcpy(data, dm, dm->length);
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dev = alloc_bootmem(sizeof(*dev));
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if (!dev) {
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printk(KERN_ERR "dmi_save_ipmi_device: out of memory.\n");
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return;
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}
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dev->type = DMI_DEV_TYPE_IPMI;
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dev->name = "IPMI controller";
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dev->device_data = data;
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list_add(&dev->list, &dmi_devices);
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}
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/*
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* Process a DMI table entry. Right now all we care about are the BIOS
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* and machine entries. For 2.5 we should pull the smbus controller info
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* out of here.
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*/
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static void __init dmi_decode(struct dmi_header *dm)
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{
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switch(dm->type) {
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case 0: /* BIOS Information */
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dmi_save_ident(dm, DMI_BIOS_VENDOR, 4);
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dmi_save_ident(dm, DMI_BIOS_VERSION, 5);
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dmi_save_ident(dm, DMI_BIOS_DATE, 8);
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break;
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case 1: /* System Information */
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dmi_save_ident(dm, DMI_SYS_VENDOR, 4);
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dmi_save_ident(dm, DMI_PRODUCT_NAME, 5);
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dmi_save_ident(dm, DMI_PRODUCT_VERSION, 6);
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dmi_save_ident(dm, DMI_PRODUCT_SERIAL, 7);
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break;
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case 2: /* Base Board Information */
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dmi_save_ident(dm, DMI_BOARD_VENDOR, 4);
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dmi_save_ident(dm, DMI_BOARD_NAME, 5);
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dmi_save_ident(dm, DMI_BOARD_VERSION, 6);
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break;
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case 10: /* Onboard Devices Information */
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dmi_save_devices(dm);
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break;
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case 38: /* IPMI Device Information */
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dmi_save_ipmi_device(dm);
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}
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}
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void __init dmi_scan_machine(void)
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{
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u8 buf[15];
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char __iomem *p, *q;
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/*
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* no iounmap() for that ioremap(); it would be a no-op, but it's
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* so early in setup that sucker gets confused into doing what
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* it shouldn't if we actually call it.
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*/
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p = ioremap(0xF0000, 0x10000);
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if (p == NULL)
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goto out;
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for (q = p; q < p + 0x10000; q += 16) {
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memcpy_fromio(buf, q, 15);
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if ((memcmp(buf, "_DMI_", 5) == 0) && dmi_checksum(buf)) {
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u16 num = (buf[13] << 8) | buf[12];
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u16 len = (buf[7] << 8) | buf[6];
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u32 base = (buf[11] << 24) | (buf[10] << 16) |
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(buf[9] << 8) | buf[8];
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/*
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* DMI version 0.0 means that the real version is taken from
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* the SMBIOS version, which we don't know at this point.
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*/
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if (buf[14] != 0)
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printk(KERN_INFO "DMI %d.%d present.\n",
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buf[14] >> 4, buf[14] & 0xF);
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else
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printk(KERN_INFO "DMI present.\n");
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if (dmi_table(base,len, num, dmi_decode) == 0)
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return;
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}
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}
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out: printk(KERN_INFO "DMI not present.\n");
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}
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/**
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* dmi_check_system - check system DMI data
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* @list: array of dmi_system_id structures to match against
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*
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* Walk the blacklist table running matching functions until someone
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* returns non zero or we hit the end. Callback function is called for
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* each successfull match. Returns the number of matches.
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*/
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int dmi_check_system(struct dmi_system_id *list)
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{
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int i, count = 0;
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struct dmi_system_id *d = list;
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while (d->ident) {
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for (i = 0; i < ARRAY_SIZE(d->matches); i++) {
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int s = d->matches[i].slot;
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if (s == DMI_NONE)
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continue;
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if (dmi_ident[s] && strstr(dmi_ident[s], d->matches[i].substr))
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continue;
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/* No match */
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goto fail;
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}
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count++;
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if (d->callback && d->callback(d))
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break;
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fail: d++;
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}
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return count;
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}
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EXPORT_SYMBOL(dmi_check_system);
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/**
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* dmi_get_system_info - return DMI data value
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* @field: data index (see enum dmi_filed)
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*
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* Returns one DMI data value, can be used to perform
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* complex DMI data checks.
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*/
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char *dmi_get_system_info(int field)
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{
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return dmi_ident[field];
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}
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EXPORT_SYMBOL(dmi_get_system_info);
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/**
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* dmi_find_device - find onboard device by type/name
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* @type: device type or %DMI_DEV_TYPE_ANY to match all device types
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* @desc: device name string or %NULL to match all
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* @from: previous device found in search, or %NULL for new search.
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*
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* Iterates through the list of known onboard devices. If a device is
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* found with a matching @vendor and @device, a pointer to its device
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* structure is returned. Otherwise, %NULL is returned.
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* A new search is initiated by passing %NULL to the @from argument.
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* If @from is not %NULL, searches continue from next device.
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*/
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struct dmi_device * dmi_find_device(int type, const char *name,
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struct dmi_device *from)
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{
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struct list_head *d, *head = from ? &from->list : &dmi_devices;
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for(d = head->next; d != &dmi_devices; d = d->next) {
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struct dmi_device *dev = list_entry(d, struct dmi_device, list);
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if (((type == DMI_DEV_TYPE_ANY) || (dev->type == type)) &&
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((name == NULL) || (strcmp(dev->name, name) == 0)))
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return dev;
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}
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return NULL;
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}
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EXPORT_SYMBOL(dmi_find_device);
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